"Steven wanted to make a game where the complexity and challenge of using your brain to look at three dimensional puzzles, and throw objects at it, and knock them over, was intriguing enough for adults to be interested.

"And at the same time this kinetic, visceral feeling would be attractive to children as well."

Castle adds: "As Steven would say: 'Kids just like to break things'."

The development team spent a long time working on the control system for the game.

Spielberg came up with the idea of the game

"We brought in the best computer scientists and we working on analysing the data you get from the Wii remote," says Castle.

"That was actually a very, very difficult problem involving lots of calculus.

"So many Wii games record just what the Wiimote is doing without much thought about or at least computation about what it was intended by the player.

"We've put a lot of thought and energy into what was intended by the consumer."

Spielberg's skill, says Castle, is to understand the player.

"More than anything he gets people. I have made a lot of games, more than a hundred and I am quite accomplished in this field, even I don't have that kind of instinct.

"Steve's instinct on people is incredible. He really understands what they are going to say about the game and what they are going to enjoy about it."

Castle is at pains to emphasise that Spielberg's attachment to the game is no marketing hook.

"This collaboration is not about attaching Steven's name to a game to make it sell. This is a creative collaboration between people in very different entertainment fields trying to make a product that will appeal to a very broad audience.

"We're making Steven's game and of course he's going to talk about it because he is excited about his game."